A 35-year-old inmate at the Milwaukee County Jail died Friday, officials said.

According to a statement from the Milwaukee County Sheriff's Office, a correctional officer called medical staff about an inmate in distress Friday afternoon. Authorities said the man was conscious and breathing in the mental health unit at the jail.

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Medical staff called for an ambulance and then began CPR when the man stopped breathing. Attempts to revive him failed, and he was pronounced dead.

The inmate was brought to the jail on Oct. 17 by the South Milwaukee Police Department.

An autopsy was scheduled to determine the cause of death. The Waukesha County Sheriff's Department will investigate.

The death was the second of the year at the facility after the death of a 51-year-old man in August. Three inmates and a newborn baby died at the facility in separate incidents between April and November of 2016.